The Collaborative International Dictionary of English v.0.48:

Palmic \Pal"mic\, a. [Cf. F. palmique.] (Chem.)
   Of, pertaining to, or derived from, the castor-oil plant
   (Ricinus communis, or Palma Christi) and other species of
   the family Euphorbiaceae; -- formerly used to designate an
   acid now called ricinoleic acid (d-12-hydroxyoleic acid,
   C18H34O3). [Obsoles.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

ricinoleic acid \ric`in*o"le*ic ac"id\, n. (Chem.)
   An organic acid (C18H34O3) obtained from the castor-oil
   plant (Ricinus communis, or Palma Christi) and other
   species of the family Euphorbiaceae; chemicaly it is
   d-12-hydroxyoleic acid
   (CH3(CH2)5.CH(OH).CH2.CH=CH.(CH2)7COOH). Formerly called
   palmic acid.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Ricinoleic \Ric`in*o"le*ic\, a. (Chem.)
   Pertaining to, or designating, a fatty acid analogous to
   oleic acid, obtained from castor oil as an oily substance,
   C18H34O3 with a harsh taste. Formerly written ricinolic
   and formerly referred to as palmic.
   [1913 Webster +PJC]